One of us grew up poor in the South Bronx of the 1960s and went on to lead a children’s antipoverty program in Harlem. Another grew up in a small town in South Jersey, and went on to be a leading money manager. The third grew up in a small suburb in upstate New York and found his way to serve in the government amid the financial crisis.

One of us is a Democrat; one, an independent; another, a Republican. Yet, together, we recognize several hard truths: Government spending levels are unsustainable. Higher taxes, however advisable or not, fail to come close to solving the problem. Discretionary spending must be reduced but without harming the safety net for our most vulnerable, or sacrificing future growth (e.g., research and education). Defense andhomeland security spending should not be immune to reductions. Most consequentially, the growth in spending on entitlement programs—Social Security, Medicaid and Medicare—must be curbed.

These truths are not born of some zeal for austerity or unkindness, but of arithmetic. The growing debt burden threatens to crush the next generation of Americans.